/*
 * Copyright (c) 2010-2011, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "alkes/core/Memory.h"


//#define AL_TRACE_MALLOC_ADDRESS
//#define AL_CHECK_HEAP_OVERRUN


#if defined(AL_TRACE_MALLOC_ADDRESS)
static uint32_t s_malloc_cnt = 0;
#define PRINT_ALLOC(ptr, size)  AL_DBG("a: %p, %d, %d", ptr, size, s_malloc_cnt++)
#define PRINT_FREE(ptr)         AL_DBG("f: %p", ptr)
#else
#define PRINT_ALLOC(ptr, size)  do{}while(0)
#define PRINT_FREE(ptr)         do{}while(0)
#endif

#if defined(AL_CHECK_HEAP_OVERRUN)
#define allocate(size)  dbg_malloc(size)
#define deallocate(ptr) dbg_free(ptr)
static void* dbg_malloc(size_t size);
static void dbg_free(void* ptr);
#else
#define allocate(size)  malloc(size)
#define deallocate(ptr) free(ptr)
#endif

AL_EXPORT_API void* alkes_malloc_r(size_t size)
{
    void* ptr = allocate(size);
    PRINT_ALLOC(ptr, size);
    return ptr;
}

AL_EXPORT_API void alkes_free_r(void* ptr)
{
    PRINT_FREE(ptr);
    deallocate(ptr);
}

#if defined(AL_CHECK_HEAP_OVERRUN)

struct DebugChecker
{
    uint32_t size_;
    uint32_t marker_;
};

#define PRE_MARKER      (0xDEADBEEF)
#define OVERRUN_CHECKER (0xAABBCCDD)

#define END_MARKER_PTR(p)   ((uint32_t*)(((DebugChecker*)(p))->size_ + sizeof(DebugChecker) + (uint8_t*)(p)))

static void* dbg_malloc(size_t size)
{
    size = (size + 0x3) & (~0x3);
    DebugChecker* p = (DebugChecker*)malloc(size + sizeof(DebugChecker) + sizeof(uint32_t));

    p->size_ = size;
    p->marker_ = PRE_MARKER;
    *END_MARKER_PTR(p) = OVERRUN_CHECKER;

    return p + 1;
}

static void dbg_free(void* ptr)
{
    DebugChecker* p = (DebugChecker*)((uint8_t*)ptr - sizeof(DebugChecker));

    AL_ASSERT(p->marker_ == PRE_MARKER);
    AL_ASSERT(*END_MARKER_PTR(p) == OVERRUN_CHECKER);

    memset(p + 1, 0, p->size_);

    free(p);
}

#endif
